loop-logos.php

<?php
    $args = array( 'category_name' => 'logos', 'numberposts' => 3 );
    $lastposts = get_posts( $args );
    if($lastposts) {
        foreach($lastposts as $the_post) $lastpostid[]= $the_post->ID;
    }else{
        $lastpostid[]= 0;
    }
    rewind_posts();
    var_dump( $lastpostid );
?>

<?php
$args = array(
    'category_name' => 'logos',
    'posts_per_page'     => 24,
    'orderby'    => 'rand'
);
?>

<?php query_posts($args); ?>
    <?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
        <div class="thumb">
            <?php if (in_array($post->ID,$lastpostid) ) : ?>
                <div class="new">
                    <a href="<?php the_permalink(); ?>"><img src="<?php bloginfo("template_directory"); ?>/images/spacer.png" /></a>
                </div>
            <?php endif ?>
            <?php if (has_post_thumbnail()) {
                the_post_thumbnail("thumb"); ?>
            <?php }
            else { ?>
                <img src="<?php bloginfo("template_directory"); ?>/images/thumb.jpg" />
            <?php } ?>
        </div>
    <?php endwhile; else: ?>
        <p><?php _e("Sorry, no posts matched your criteria."); ?></p>
    <?php endif; ?>
<?php wp_reset_query(); ?>